Wei Mi ef67950b62 Limiting gep merging to fix the performance problem described in ... https://llvm.org/bugs/show_bug.cgi?id=23163. Gep merging sometimes behaves like a reverse CSE/LICM optimization, which has negative impact on performance. In this patch we restrict gep merging to happen only when the indexes to be merged are both consts, which ensures such merge is always beneficial. The patch makes gep merging only happen in very restrictive cases. It is possible that some analysis/optimization passes rely on the merged geps to get better result, and we havn't notice them yet. We will be ready to further improve it once we see the cases. Differential Revision: http://reviews.llvm.org/D8911 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235455 91177308-0d34-0410-b5e6-96231b3b80d8		2015-04-21 23:02:15 +00:00
..
ADCE
AddDiscriminators
AlignmentFromAssumptions
ArgumentPromotion	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
AtomicExpand/ARM
BBVectorize
BDCE
BranchFolding
CodeExtractor
CodeGenPrepare	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
ConstantHoisting	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
ConstantMerge
ConstProp
CorrelatedValuePropagation
DeadArgElim	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
DeadStoreElimination	DebugInfo: Add missing !dbg attachments to intrinsics	2015-04-15 21:04:10 +00:00
EarlyCSE
Float2Int
FunctionAttrs	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
GCOVProfiling	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
GlobalDCE	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
GlobalOpt	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
GVN	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
IndVarSimplify	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
Inline	[InlineFunction] Don't add lifetime markers for zero-sized allocas.	2015-04-20 16:11:05 +00:00
InstCombine	Limiting gep merging to fix the performance problem described in	2015-04-21 23:02:15 +00:00
InstMerge
InstSimplify	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
Internalize
IPConstantProp
IRCE
JumpThreading	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LCSSA
LICM	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LoadCombine
LoopDeletion
LoopIdiom
LoopInterchange	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LoopReroll
LoopRotate	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LoopSimplify
LoopStrengthReduce	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LoopUnroll	[LoopUnrollRuntime] Avoid high-cost trip count computation.	2015-04-14 03:20:38 +00:00
LoopUnswitch	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LoopVectorize
LowerAtomic
LowerBitSets
LowerExpectIntrinsic	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
LowerInvoke
LowerSwitch
Mem2Reg	DebugInfo: Remove 'inlinedAt:' field from MDLocalVariable	2015-04-15 22:29:27 +00:00
MemCpyOpt	[MemCpyOpt] Use the raw i8* dest when optimizing memset+memcpy.	2015-04-21 21:28:33 +00:00
MergeFunc
MetaRenamer
NaryReassociate	[NaryReassociate] run NaryReassociate iteratively	2015-04-17 00:25:10 +00:00
ObjCARC	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
PartiallyInlineLibCalls
PhaseOrdering	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
PlaceSafepoints	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
PruneEH
Reassociate	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
Reg2Mem
RewriteStatepointsForGC	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
SampleProfile	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
Scalarizer
ScalarRepl	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
SCCP	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
SeparateConstOffsetFromGEP/NVPTX	[SeparateConstOffsetFromGEP] garbage-collect intermediate instructions	2015-04-21 19:53:18 +00:00
SimplifyCFG	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
Sink
SLPVectorizer	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
SROA
StraightLineStrengthReduce	[SLSR] garbage-collect unused instructions	2015-04-21 19:56:18 +00:00
StripSymbols
StructurizeCFG
TailCallElim
TailDup	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
Util